A minor one.
My mother picked me up from the airport a few years back. She paid for the parking, got the ticket validated, and then put the ticket in the centre console. I even commented on the ticket being there (as my usual trick in that situation is trying to hold the ticket in my mouth as I drive, which is less than optimal). Less than a minute later we pull up at the exit for the parking lot, my mum reaches into the console, and the ticket is not there. We just about pulled the car apart looking for it, taking up the floor mats and checking under seats. No ticket. Thankfully we were able to call someone from security, who believed our story and let us out of the parking lot.
The car is serviced, detailed, cleaned several times. Ticket never turns up. The ticket definitely made it into the car, the car was not opened before the gate, so where the heck did it go?